/*
 * Alloy Analyzer 4 -- Copyright (c) 2006-2008, Felix Chang
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package edu.ut.ece382c.valloy.ast;

import edu.mit.csail.sdg.alloy4.Pos;
import edu.mit.csail.sdg.alloy4.Err;
import edu.mit.csail.sdg.alloy4.JoinableList;
import static edu.ut.ece382c.valloy.ast.Type.EMPTY;

/**
 * Immutable; represents an illegal node.
 *
 * <p> <b>Invariant:</b>  this.type==EMPTY && this.errors.size()==1
 */

public final class ExprBad extends Expr {

    /** The original source text that caused the error. */
    private final String originalText;

    /** {@inheritDoc} */
    @Override public Pos span() { return pos; }

    /** {@inheritDoc} */
    @Override public void toString(StringBuilder out, int indent, boolean newline) {
    	for(int i=0; i<indent && newline; i++) { out.append(' '); }
    	out.append(originalText);
    }

    /** Constructs an ExprBad object. */
    public ExprBad(Pos pos, String originalText, Err error) {
        super(pos, null, false, EMPTY, 0, 0, new JoinableList<Err>(error));
        this.originalText = originalText;
    }

    /** {@inheritDoc} */
    public int getDepth() { return 1; }

    /** {@inheritDoc} */
    @Override final<T> T accept(VisitReturn<T> visitor) throws Err { return visitor.visit(this); }
}
